Investigations on the electric-dipole allowed 4f25d → 4f3 broadband emission of Nd3+-doped 20Al(PO3)3-80LiF glass for potential VUV scintillator application

Melvin John F. Empizo, Yuki Minami, Kohei Yamanoi, Toshihiko Shimizu, Masashi Yoshimura, Nobuhiko Sarukura, Takahiro Murata, Akihiro Yamaji, Akira Yoshikawa, Malgorzata Guzik, Yannick Guyot, Georges Boulon, Marilou Cadatal-Raduban

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1 Citation (Scopus)

Abstract

We report the absorption and emission properties of neodymium (Nd3+)-doped APLF glasses [20Al(PO3)3-80LiF + x NdF3, x = 0.5–2.0 mol%] as potential vacuum ultraviolet (VUV) scintillator materials due to their interconfigurational 4f25d transitions which have not yet been investigated. The Nd3+-doped APLF glasses exhibit absorption and emission peaks from the VUV to the near-infrared (NIR) regions which correspond to the different interconfigurational 4f25d and intraconfigurational 4f3 transitions of Nd3+ ions. Detailed analysis of the absorption and emission spectra reveals that the Nd3+-doped glass has a disordered structure and low symmetry, as expected from amorphous materials. However, the most important feature of these glasses is their electric-dipole allowed 4f25d → 4f3 (4I9/2) broadband emissions, between two configurations of opposite parity, around 187 nm (VUV) whose ~ 5.0 ns decay times are faster than known Nd3+-doped scintillators. At room temperature (RT), the absorption edge located around 192 nm overlaps with this VUV emission indicating that self-absorption primarily limits the emission intensity. This overlap could potentially be minimized by working at low temperatures and doping with higher (>2.0 mol%) concentrations. Despite the presence of self-absorption, the fast emission decay times from the 4f25d excited state make the Nd3+-doped APLF glasses promising new VUV scintillator materials for high-counting-rate fast neutron detection.

Original languageEnglish
Article number158096
JournalJournal of Alloys and Compounds
Volume856
DOIs
Publication statusPublished - 2021 Mar 5

Keywords

  • 4f5d and 4f configurations
  • Aluminum lithium fluorophosphate glass
  • Nd doping
  • Neutron detection
  • Spectroscopy
  • VUV scintillator

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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